How much more do you want to know? You have the wall lowering at exactly k = sin(θ) so the light appears instantly on the ground from the 55 foot mark to the 27.5 foot “destination”. If you increase k further, the denominator will become negative, suggesting the velocity of the shadow will now reverse. […]

If you’ve stumbled here in your search for the Speed of Darkness Series, I encourage you to first read Part 1 of this series, The Speed of Darkness. So, shadows traveling faster than the speed of light are one thing, singularities in equations are quite another. First, I should put some specifics on this situation for […]